En-7
3.5. Installing the unit
• Install the unit level. (Within 0.3 degrees.)
• To minimize vibration, do not install the outdoor unit directly on the ground.
• The foundation base should be able to support the product and the foot width of the
product should be more than 2 in (46.5 mm).
• Depending on the installation condition, vibration during the operation of the unit may
cause noise and vibration.
Install vibration-proofing materials (such as rubber pads).
• Consider the removal space of the connection piping when installing the foundation.
• Secure the equipment firmly with anchor bolts, washers, and nuts.
• When installing piping from the
bottom of the outdoor units, the
required space under the outdoor
unit ≥ 8 in (200 mm).
* Install the branch kit horizontally.
8 in (200 mm)
or more
• Do not install directly on the ground, this may result in equipment failure. Provide ample
space for ice buildup from condensate between the bottom of the unit and the flat sur-
face on which it is mounted. Otherwise, there is risk that the drainage water will freeze
between the device and the surface, disabling drainage.
Base
CAUTION
If the unit is installed in a region that is exposed to high winds, freez-
ing conditions, freezing rain, snow fall or heavy snow accumulation,
take appropriate measures to protect it from those elements.
To ensure stable operation, the outdoor unit must be installed on a
raised stand or rack, at or above the anticipated snow depth for the
region.
The installation of snow hoods and drift prevention fencing is recom-
mended when blowing and drifting snow is common to the region.
AOUA72/96/120
• Install it on top of a firm platform (such as concrete block).
Fixing bolts and
nuts (M12)
* Do not use a four-corner
support foundation.
GOOD GOOD
PROHIBITED
• Install 4 or more anchor bolts at the 8 locations indicated by arrows.
• Place the left and right anchor bolts at a distance further away than the dimensions of A
in the following table. (Excluding the case where anchor bolts are installed at 8 places.)
6-5/16
(160)
3-1/8
(80)
1-5/8
(42)
3-1/8
(80)
3-1/4
(82)
7-3/4
(197)
3-1/8
(80)
A
B
6-5/16
(160)
28-13/16 (732)
30-1/8 (765)
Unit: in (mm)
Model
A
[in (mm)]
B
[in (mm)]
AOUA72
24
(610)
36-5/8
(930)
AOUA96
AOUA120
36-1/4
(920)
48-13/16
(1,240)
Holes: 1/2 × 11/16 (12 × 17) (8 places)
Knockout panel for bottom piping
AOUA144/168/192
• Install it on top of a firm platform (such as concrete block).
* Do not use a four-corner support
foundation.
GOOD GOOD
PROHIBITED
Fixing bolts
and nuts
(M12)
• Install 6 or more anchor bolts at the 10 locations indicated by arrows.
6-5/16
(161)
6-5/16
(238)
3-1/8
(80)
3-1/4
(83)
5-5/16
(135)
8-11/16
(220)
28-13/16 (732)
30-1/8 (765)
Holes: 1/2 × 11/16 (12 × 17) (10 places)
Unit: in (mm)
Knockout panel for bottom piping
63 (1,600)
44-3/16 (1,122)
56-4/3 (1,444)
4. SYSTEM CONFIGURATION (for Heat Pump sys-
tem)
About for Heat Recovery system, refer to “5. SYSTEM CONFIGURATION (for Heat
Recovery system)”.
For detailed information, refer to the Design & Technical manual.
4.1. System configuration (for Heat Pump system)
CAUTION
• When connecting multiple outdoor units, set the nearest outdoor unit to the indoor unit
on the refrigerant pipe as the primary unit.
• When connecting multiple outdoor units, install the outdoor unit with the largest
nominal system capacity nearest to the indoor unit on the refrigerant pipe, followed by
those with less nominal system capacities.
[Capacity: Primary ≥ Subordinate]
• Always keep to the limit on the total amount of refrigerant. Exceeding the limit on the
total amount of refrigerant when charging will lead to malfunction.
4.1.1 In case of 1 outdoor unit connected
I.U.
I.U. I.U. I.U.
I.U.
I.U. I.U. I.U. I.U.
f
p
H2
H1
H3
a
g
q
O.U.
O.U. :Outdoor unit
I.U. :Indoor unit
Allowable pipe length (actual pipe length)
Between primary outdoor unit and the farthest
indoor unit
541 ft (165 m) or less
a + f
a + p
Between the first separation tube and the
farthest indoor unit
295 ft (90 m) or less
f, p
(Farthest indoor unit) - (Closest indoor unit) 196 ft (60 m) or less
f (p) - g (q)
Total pipe length 2,296 ft (700 m) or less
Total
Allowable height difference
Between outdoor unit and indoor unit (When
indoor unit is installed below)
164 ft (50 m) or less (*1)
H1
Between outdoor unit and indoor unit (When
outdoor unit is installed below)
131 ft (40 m) or less
Between indoor units 164 ft (50 m) or less
H2, H3
*1: For installations over 164 ft (50 m), refer to the Design & Technical manual.
9378945722-05_IM_L3.indb 79378945722-05_IM_L3.indb 7 2023/3/24 9:23:482023/3/24 9:23:48
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